What if they had Splice onto "Blah" where blah was something else? They get to reuse the rule but it could be "splice onto Creature", etc..

If done really well it could be super-flavorful. Imagine

Gather the Elders
Return a creature you control to it's owner's hand; search your deck for a card with the same creature type, reveal it, and put it into your hand.
Splice onto Goblin {1}{R}

It's like the goblin went to grab someone important!